T H E   R E T R O B O R O
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                           TEMPORAL RETROLOGY
       
               Up-To-Date Retrofitting Of The Out-Of-Date
       
       
       
       
        The 4-function Calculator -
        enhancements for dates on a panoply of Christian calendars:
       
  TEXT  Julian & Old-Style/Byzantine/Anglican/Gregorian adaptations
  TEXT  Julian, Century 19 & 20 Gregorian 
  TEXT  Century 19 & 20 Gregorian 
  TEXT  Gregorian